<template>
    <div>
      <!-- 面包屑导航区域 -->
        <el-breadcrumb separator="/">
        <el-breadcrumb-item :to="{ path: '/home' }">首页</el-breadcrumb-item>
        <el-breadcrumb-item>商品管理</el-breadcrumb-item>
        <el-breadcrumb-item>添加商品</el-breadcrumb-item>
        </el-breadcrumb>
        <!-- 卡片视图区域 -->
        <el-card>
          <!-- 提示区域 -->
          <el-alert
            title="添加商品信息"
            type="info"
            show-icon
            :closable="false"
            center>
          </el-alert>
          <!-- 步骤条区域 -->
          <el-steps :space="200" :active="activeIndex - 0" finish-status="success" align-center>
            <el-step title="基本信息"></el-step>
            <el-step title="商品参数"></el-step>
            <el-step title="商品属性"></el-step>
            <el-step title="商品图片"></el-step>
            <el-step title="商品内容"></el-step>
            <el-step title="完成"></el-step>
          </el-steps>
          <!-- 标签页区域 -->
          <el-form :model="addForm" :rules="addFormRules" ref="addFormRef" label-width="100px" label-position="top">
            <el-tabs :tab-position="tabPosition" v-model="activeIndex" :before-leave="beforeTabLeave" @tab-click="tabClicked">
              <el-tab-pane label="基本信息" name="0">
                <el-form-item label="商品名称" prop="goods_name">
                  <el-input v-model="addForm.goods_name"></el-input>
                </el-form-item>
                <el-form-item label="商品价格" prop="goods_price">
                  <el-input v-model="addForm.goods_price" type="number"></el-input>
                </el-form-item>
                <el-form-item label="商品重量" prop="goods_weight">
                  <el-input v-model="addForm.goods_weight" type="number"></el-input>
                </el-form-item>
                <el-form-item label="商品数量" prop="goods_number">
                  <el-input v-model="addForm.goods_number" type="number"></el-input>
                </el-form-item>
                <el-form-item label="商品分类" prop="goods_cat">
                <el-cascader
                  v-model="addForm.goods_cat"
                  :options="cateList"
                  :props="{ expandTrigger: 'hover', value: 'cat_id', label: 'cat_name', children: 'children'}"
                  @change="handleChange"
                  style="width:250px"></el-cascader>
                </el-form-item>
              </el-tab-pane>
              <el-tab-pane label="商品参数" name="1">
                <el-form-item :label="item.attr_name" v-for="item in manyTableData" :key="item.attr_id">
                  <el-checkbox-group v-model="item.attr_vals">
                    <el-checkbox :label="item" v-for="(item, index) in item.attr_vals" :key="index" border></el-checkbox>
                  </el-checkbox-group>
                </el-form-item>
              </el-tab-pane>
              <el-tab-pane label="商品属性" name="2">
                <el-form-item :label="item.attr_name" v-for="(item, index) in onlyTableData" :key="index">
                  <el-input v-model="item.attr_vals"></el-input>
                </el-form-item>
              </el-tab-pane>
              <el-tab-pane label="商品图片" name="3">
                  <!-- action表示图片要上传到的后台API地址 -->
                  <el-upload
                    :action="uploadURL"
                    :on-preview="handlePreview"
                    :on-remove="handleRemove"
                    list-type="picture"
                    :headers="headerObj"
                    :on-success="handleSuccess">
                    <el-button size="small" type="primary">点击上传</el-button>
                    <div slot="tip" class="el-upload__tip">只能上传jpg/png文件，且不超过500kb</div>
                  </el-upload>
              </el-tab-pane>
              <el-tab-pane label="商品内容" name="4">
                <quill-editor
                  v-model="addForm.goods_introduce"
                />
                <el-button type="primary" class="btnAdd" @click="add">添加商品</el-button>
              </el-tab-pane>
            </el-tabs>
          </el-form>
        </el-card>
        <!-- 图片预览对话框 -->
        <el-dialog
          title="图片预览"
          :visible.sync="PreviewDialogVisible"
          width="50%">
          <img :src="PreviewURL" alt="上传的图片" class="previewImg">
        </el-dialog>
    </div>
</template>

<script>
import _ from 'lodash'
export default {
  data () {
    return {
      // 步骤条激活项
      activeIndex: '0',
      // tab栏位置
      tabPosition: 'left',
      // 添加商品表单绑定数据
      addForm: {
        goods_name: '',
        goods_price: 0,
        goods_weight: 0,
        goods_number: 0,
        goods_cat: [],
        pics: [],
        goods_introduce: '',
        attrs: []
      },
      // 表单验证规则
      addFormRules: {
        goods_name: [
          { required: true, message: '请输入商品名称', trigger: 'blur' }
        ],
        goods_price: [
          { required: true, message: '请输入商品价格', trigger: 'blur' }
        ],
        goods_weight: [
          { required: true, message: '请输入商品重量', trigger: 'blur' }
        ],
        goods_number: [
          { required: true, message: '请输入商品数量', trigger: 'blur' }
        ],
        goods_cat: [
          { required: true, message: '请选择商品分类', trigger: 'blur' }
        ]
      },
      // 商品分类列表
      cateList: [],
      // 动态参数列表
      manyTableData: [],
      // 静态属性列表
      onlyTableData: [],
      // 图片上传的后台地址
      uploadURL: 'http://127.0.0.1:8888/api/private/v1/upload',
      headerObj: {
        Authorization: window.sessionStorage.getItem('token')
      },
      // 控制图片预览对话框显示
      PreviewDialogVisible: false,
      // 预览图片的URL
      PreviewURL: ''
    }
  },
  created () {
    this.getCateList()
  },
  methods: {
    // 获取商品数据
    async getCateList () {
      const { data: res } = await this.$http.get('categories')
      if (res.meta.status !== 200) return this.$message.error('获取商品分类数据失败!')
      this.cateList = res.data
    },
    // 级联选择器发送改变
    handleChange () {
      if (this.addForm.goods_cat.length !== 3) {
        this.addForm.goods_cat = []
      }
    },
    // 获取参数
    async getParamsList (sel) {
      const { data: res } = await this.$http.get(`categories/${this.cateId}/attributes`, {
        params: {
          sel: sel
        }
      })
      if (res.meta.status !== 200) return this.$message.error('获取商品参数失败!')
      if (sel === 'many') {
        res.data.forEach(item => {
          item.attr_vals = item.attr_vals.length === 0 ? [] : item.attr_vals.split(' ')
        })
        this.manyTableData = res.data
      } else {
        this.onlyTableData = res.data
      }
    },
    // 判断Tab页是否可以切换的方法
    beforeTabLeave (newTab, oldTab) {
      if (oldTab === '0' && this.addForm.goods_cat.length !== 3) {
        this.$message.error('请选择商品分类!')
        return false
      }
    },
    // Tab页被点击是触发
    tabClicked () {
      // 如果是商品参数页就去获取参数列表
      if (this.activeIndex === '1') {
        this.getParamsList('many')
      } else if (this.activeIndex === '2') {
        this.getParamsList('only')
      }
    },
    // 处理图片预览
    handlePreview (file) {
      this.PreviewDialogVisible = true
      this.PreviewURL = file.response.data.url
    },
    // 处理移除图片操作
    handleRemove (file) {
      const index = this.addForm.pics.findIndex(item => item.pic === file.response.data.tmp_path)
      this.addForm.pics.splice(index, 1)
    },
    // 监听图片上传成功
    handleSuccess (response) {
      this.addForm.pics.push({ pic: response.data.tmp_path })
    },
    // 添加商品
    add () {
      this.$refs.addFormRef.validate(async valid => {
        if (!valid) return this.$message.error('请正确填写必要的表单项')
        // 执行添加的业务逻辑
        const form = _.cloneDeep(this.addForm)
        form.goods_cat = form.goods_cat.join(',')
        // 处理动态参数和静态属性
        this.manyTableData.forEach(item => {
          const newInfo = {
            attr_id: item.attr_id,
            attr_value: item.attr_vals.join(' ')
          }
          this.addForm.attrs.push(newInfo)
        })
        this.onlyTableData.forEach(item => {
          const newInfo = {
            attr_id: item.attr_id,
            attr_value: item.attr_vals
          }
          this.addForm.attrs.push(newInfo)
        })
        form.attrs = this.addForm.attrs
        const { data: res } = await this.$http.post('goods', form)
        // console.log(res)
        if (res.meta.status !== 201) return this.$message.error('添加商品失败！')
        this.$message.success('添加商品成功!')
        this.activeIndex = '5'
        this.$router.push('/goods')
      })
    }
  },
  computed: {
    cateId () {
      if (this.addForm.goods_cat.length === 3) {
        return this.addForm.goods_cat[2]
      }
      return null
    }
  }
}
</script>

<style lang="less" scoped>
.el-checkbox {
  margin: 0 10px 0 0;
}
.previewImg {
  width: 100%;
}
.btnAdd {
  margin-top: 15px;
}
</style>
